<!-- yangbuyi Copyright (c) https://yby6.com 2023. -->

<template>
  <view class="u-line-progress" :style="[$u.addStyle(customStyle)]">
    <view
      class="u-line-progress__background"
      ref="u-line-progress__background"
      :style="[
        {
          backgroundColor: inactiveColor,
          height: $u.addUnit(height),
        },
      ]"
    >
    </view>
    <view class="u-line-progress__line" :style="[progressStyle]">
      <slot>
        <text
          v-if="showText && percentage >= 10"
          class="u-line-progress__text"
          >{{ innserPercentage + "%" }}</text
        >
      </slot>
    </view>
  </view>
</template>

<script>
import props from "./props.js";
// #ifdef APP-NVUE
const dom = uni.requireNativePlugin("dom");
// #endif
/**
 * lineProgress 线型进度条
 * @description 展示操作或任务的当前进度，比如上传文件，是一个线形的进度条。
 * @tutorial https://www.uviewui.com/components/lineProgress.html
 * @property {String}			activeColor		激活部分的颜色 ( 默认 '#19be6b' )
 * @property {String}			inactiveColor	背景色 ( 默认 '#ececec' )
 * @property {String | Number}	percentage		进度百分比，数值 ( 默认 0 )
 * @property {Boolean}			showText		是否在进度条内部显示百分比的值 ( 默认 true )
 * @property {String | Number}	height			进度条的高度，单位px ( 默认 12 )
 *
 * @example <u-line-progress :percent="70" :show-percent="true"></u-line-progress>
 */
export default {
  name: "u-line-progress",
  mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
  data() {
    return {
      lineWidth: 0,
    };
  },
  watch: {
    percentage(n) {
      this.resizeProgressWidth();
    },
  },
  computed: {
    progressStyle() {
      let style = {};
      style.width = this.lineWidth;
      style.backgroundColor = this.activeColor;
      style.height = uni.$u.addUnit(this.height);
      return style;
    },
    innserPercentage() {
      // 控制范围在0-100之间
      return uni.$u.range(0, 100, this.percentage);
    },
  },
  mounted() {
    this.init();
  },
  methods: {
    init() {
      uni.$u.sleep(20).then(() => {
        this.resizeProgressWidth();
      });
    },
    getProgressWidth() {
      // #ifndef APP-NVUE
      return this.$uGetRect(".u-line-progress__background");
      // #endif

      // #ifdef APP-NVUE
      // 返回一个promise
      return new Promise((resolve) => {
        dom.getComponentRect(
          this.$refs["u-line-progress__background"],
          (res) => {
            resolve(res.size);
          }
        );
      });
      // #endif
    },
    resizeProgressWidth() {
      this.getProgressWidth().then((size) => {
        const { width } = size;
        // 通过设置的percentage值，计算其所占总长度的百分比
        this.lineWidth = (width * this.innserPercentage) / 100 + "px";
      });
    },
  },
};
</script>

<style lang="scss" scoped>
@import "../../libs/css/components.scss";

.u-line-progress {
  align-items: stretch;
  position: relative;
  @include flex(row);
  flex: 1;
  overflow: hidden;
  border-radius: 100px;

  &__background {
    background-color: #ececec;
    border-radius: 100px;
    flex: 1;
  }

  &__line {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    align-items: center;
    @include flex(row);
    color: #ffffff;
    border-radius: 100px;
    transition: width 0.5s ease;
    justify-content: flex-end;
  }

  &__text {
    font-size: 10px;
    align-items: center;
    text-align: right;
    color: #ffffff;
    margin-right: 5px;
    transform: scale(0.9);
  }
}
</style>
